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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b671a8306e8dd3906601686be04bf1ac9b081ed8120611a5600edf634726eba1' 
  AND token = '627u/SwRlKybLMvr+ZgoFGuy0B0jQwoxOTgNfVgiSSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}